Refrigerating apparatus



Jan. 17, 1933. J. G. KING REFRIGERATING APPARATUS Filed May I50, 1928 jute -gmwm Patented Jan, 17,, 1933 UNITED STATES PATENT OFFICE JESSE a. me, or DAYTON, 0310, .assienon 'ro FRIGIDAIRE CORPORATION, 02* r narrow, OHIO, A CORPORATION or DELAWARE BEFBIGERATIN G APPARATUS Y Application filed May 30,

This invention relates to refrigerating apparatus and particularly to a novel form of refrigerating element or evaporator.

One of the objects of the invention is to 6 provide an improved form of refrigerating element which is easily and'cheaply constructed and one which is smooth,'readily cleaned and of pleasing appearance.

I More specifically it is an object of the in- 10 vention to provide an improved form of evaporator, part of which may be readily coated by highftemperature processes and thereafter connected to the remaining uncoat- I ed portion in such a manner as to conceal the uncoated portion. 1 v

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanyin drawing wherein a preferred'form of em odiment of the present invention is clearly shown. i

In the drawing ting cabinet containing an evaporator constructed in accordance with the present invention; I a I Fig. 2 is'a side elevation of the refrigeratingelemcnt; I

Fig. 3 is an enlarged sectional view of a portion of the cabinet showing the refrigerating ele'ment in section;

ig. 4 is an e' larged sectional view of a portion of the refrigerating element, and

. Fig. 5 is an enlarged section on the line 5 50f Fig.3. I p I Evaporators of the typeincluding a header or tankforming a reservoir for liquid refrigerant and depending loops of pipeconnectedto the header for enclosing an icemaking receptacle and for circulating refrigerant have been known heretoforeand areexemplified by the patent to Osborn, No. 1,556,708 October 13, 1925. Objections to such evaporators are first, that they. are very expensive to manufacture, second that they are dimcult to clean, and third, that they are rather unsightly when placed in a refrigerator cab- 'inet,.and for the latterreason it has been customary ,to conceal the ,evaporators in refrigerator cabinets by a special lining or par- F'g. 1 is a front elevation of the refrigeraa 1928. Serial No. 281,607.

tition. It has also been proposed to coat. evaporators with vitreous enamel in order to provide a surface of pleasing appearance and one which is readily cleaned. It is essential to successful coating and bakin of structures of this character that the thlckness of the metal be substantially uniform in order to insure uniform heating and cooling of the structure thruout. On the other hand float controlled headers of the type shown by the Osborn patent referred toare so constructed of metal of such irregular thickness that it is impractical to enamel them. With these considerations in mind I provide a refrigerating element having an evaporating chamber of sheet metal which may be readily enameled, and a separate header or tank forming a reservoir for liquid refrigerant and containing the float control mechanism, and secure these two devices together by a detachable coupling after the evaporating chamber had been coated.

Referring to the drawing, 10 designates the usual header or tank adapted tocontain a quantity of liquid refrigerant, provided with a removable head 11 upon which issupported an inlet connection 12 for liquid refrigerant, and outlet connection 13 for gaseous refrigerant, and a float control mechanism 14. sheet of metal 15 is formed into a generally rectangular enclosure as shown in Fig. 3, and is placed inside of a sheet 16 which is similarly formed. In addition, the sheet 16 is provided with vertical corrugations 17 which provide ducts 18 for'circulating refrigerant and fins 19. The sheets 15 and 16 are welded together along their edges and the portions 17abetweenthe corrugations of sheet 16 are spot welded to the sheet 15 in order to hold I the sheets together against the pressure pf W refrigerant within the ducts 18. The above ends of the ducts 18 are connected to two pipes 25 which areadapted to convey refrige'rant to and from the'ducts 18. In order that all of the ducts may-communicate with the two pipes 25 the portions 17a of corrugations forming the individual ducts terminate loelow the pipes, the sheets 15 and 16 lacing (spaced apart at the pipes, so that all of the acts are connected in parallel. At a suit- 3% I able distance above the pipes 25 the sheets 15 30 is welded to the center of each pipe 25 and communicates with the pipe. The tank 10 has an opening thru which the nipple is insorted, and is provided with a boss 31 soldered or brazed to the tank around the opening. The boss 31 is recessed to receive a lead gasket 32 which is confined between the sides of the boss and a shoulder 33 on the nipple 30. The nipple is externally threaded at its end in order to receive a nut 34 which clamps the tank to the nipple and eifects the connection with the pipes 25. A suitable washer or other fluid tight packing 36 is interposed between the nut and the shell of the tank 10.

The sheet 15 is provided with projections 40 adapted to support shelves 41 on which ice-making containers 42 may be placed. Lugs 43 are welded or otherwise suitably secured to the sheet 16 to receive bolts 44 by which the evaporator may be supported in the cabinet In constructing my improved evaporator I make the evaporating chamber formed by sheets 15 and 16 of material such as sheet steel and coat this with vitreous enamel in theusual manner. After the coating operation the header or tank 10 is connected to the evaporating chamber as above described, the head 11 being removed to afford access to the interior of the tank while making the connections. After the connections have been made, the head 11 is bolted to the tank in the 1 usual manner and the evaporator is charged with refrigerant.

It will be noticed that the sheets 15 and 16 form an enclosure for the tank 10 and thus conceal it from view providing an evaporator whose exterior is completely covered with vitreous enamel. The evaporator as a whole is thus of a pleasing appearance, is readily cleaned and the difliculty of coating the complicated tank structure with vitreous enamel is avoided.

While the form of embodiment of the pres ent invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow. What is claimed is as follows:

1. An evaporator for refrigerating apparatus comprising in combination a tank forming a reservoir for liquid refrigerant and a sheet metal evaporating chamber, said tank being disposed within the space defined by the inner wall of said chamber and remov- 2. An evaporator for refrigerating appa ratus comprising in combination a tank forming a reservoir for liquid refrigerant and sheet metal walls joined together to form an evaporating chamber, said walls enclosing said tank, and the tank and the chamber being removably connected together.

3. An evaporator for refrigerating apparatus comprising in combination means providing a tank forming a reservoir for liquid refrigerant and a hollowwall connected to the tank for circulating refrigerant, the wall including a pair of sheets and the inner one of said sheets entirely enclosing the tank.

4. An evaporator for refrigerating apparatus comprising in combination means providing a tank forming a reservoir for liquid refrigerant, and an evaporating chamber connected to the tank, said chamber including a pair of sheets forming a hollow wall, one of the sheets enclosing the tank.

5. An evaporator for refrigerating apparatus comprising in combination a tank formhollow wall for circulating re rigerant enclosing said tank and detachably connected to the tank, said wall including a pair of sheets, one of the sheets being corrugated and the corrugations being secured to the other sheet to hold the sheets together against pressure within the wall.

6. An evaporator for refrigerating apparatus comprising in combination sheet metal walls formin an enclosure for ice-makin receptacles, t e walls including a pair 0 sheets spaced apart to provide a chamber for receiving refrigerant, a tank forming a reservoir for liquid refrigerant disposed within the enclosure and detachably connected to the chamber. i

7. Anevaporator for refrigerating apparatus comprising in combination, a tank forming a reservoir for liquid refri erant, a

walls forming an enclosure, the lower portion of said enclosure being adapted to receive ice making receptacles, the walls including a pair of sheets spaced a art to provide a chamber for receiving refrigerant, a tank forming a reservoir for liquid refrigerant disposed within the upper portion of said enclosure anddetachably connected to the chamber.

'9. An evaporator for refrigerating apparatus comprising in combination a tank forming a reservoir for liquid refrigerant and a hollow wall for circulatingrefrigerant enclosing said tank and detachably connected therewith, said wall including a pair of sheets, one of the sheets being corrugated,

said corrugations forming channels for directing air downwardly over the evaporator,

the other of said sheets providing a smooth interior surface on said hollow Wall.

10. An evaporator for refrigerating apparatus comprising in combination, a tank forming a reservoir for liquid refrigerant, a flat hollow wall detachably connected to the l tank for circulating refrigerant, said wall including a pair of sheets formed to provide an enclosure, said tank being disposed within the upper portion of said enclosure.

In testimony whereof 1 hereto afix my signature.

JESSE G. KING. 

